Build hello_world.c
using
emcc hello_world.c -Os -s WASM=1 -s SIDE_MODULE=1 -o hello_world.wasm
(make sure to use latest Emscripten incoming). That creates a
WebAssembly dynamic libraryhello_world.wasm
. You can then run
hello_world.html
in your browser, which loads and uses it.
More details: https://github.com/kripken/emscripten/wiki/WebAssembly-Standalone
Looks like the most recent version of emcc also requires -s EXPORTED_FUNCTIONS='["_doubler"]' argument to mark the function as exported (otherwise it would be killed by dce)